John 12:34 Upon which the people said to him, we have learnt from the law, that the Messiah is to live for ever: why do you say then, the son of man must be lift up? who is this son of man?

Mace⁽ⁱ⁾ ³⁴ Upon which the people said to him, we have learnt from the law, that the Messiah is to live for ever: why do you say then, the son of man must be lift up? who is this son of man?